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All these models have almost the same price ( Kawai 1150E, Yamaha 1200E, Casio 1000E)...

Yamaha sounds somewhat worse compared to Kawai... However there are several posts, where key issuses for CN 23 and CN 33 are mentioned. There Yamaha's GH may be a more reliable choice... Yamaha is also clearer to handle, has more features and an adjustable sensitivity of the key response (is it important for a child?).

None of these pianos have noticeable build construction issues. I don't think that should be a deciding factor at all. This forum sometimes gets people reporting a problem with their Kawai piano mainly because one of our members works for Kawai. But overall they don't have build quality or quality control issues. Also, Kawai and Yamaha are very good about replacing/fixing any issues that come up with their pianos. I don't know about Casio, but I suspect it's the same.

As for ease of use, that's a legitimate concern. Although in practice, what I observe is that basically everyone uses only one (maybe two) of their piano voices and very seldom changes any other settings. My MP8 is very complicated to use and there are tons of settings I don't use or don't understand. Doesn't bother me when I'm playing.

-Note: The Yamaha P95/P105's are more in line with the Casio weight. The action on the 95/105 is lighter than that on the P-155. P-155 gets more weight from a semi-larger footprint and more powerful speakers.

It has some configurable damping parameters that the PX-150 lacks. And it has better speakers and amplifiers.

But it doesn't have the extended voice set (something around 300 voices), or the "arranger" features (auto-harmony, auto-accompaniment, rhythms) that you can get in the PX-350 (stage piano) for several hundred dollars less (before adding a stand for the PX-350).

Rather than setting up a simple hierarchy -- from "most limited" to "least limited, best sound", the manufacturers have fragmented the market. It's like picking a breakfast cereal -- too many choices, and not enough comparison data.

I sympathize with everyone trying to navigate these waters!

. Charles

PS -- how does the Kawai EP3 (which is a competitor to the Yamaha P155) compare to the CN24 ?